main/mkinitfs: use trigger to create kernel links

main/mkinitfs/APKBUILD

 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=mkinitfs
 pkgver=2.0_rc5
-pkgrel=0
+pkgrel=1
 pkgdesc="Tool to generate initramfs images for Alpine"
 url=http://git.alpinelinux.org/cgit/mkinitfs
 depends="busybox"
+triggers="$pkgname.trigger:/usr/share/kernel/*"
 source="http://git.alpinelinux.org/cgit/$pkgname/snapshot/$pkgname-$pkgver.tar.bz2
 	"
 license="GPL-2"

main/mkinitfs/mkinitfs.trigger

@@ -2,7 +2,30 @@
 
 for i in "$@"; do
 	# get last element in path
-	kver=${i##*/}
-	mkinitfs $kver
+	flavor=${i##*/}
+	abi_release=$(cat "$i"/kernel.release)
+	initfs=initramfs-$abi_release
+	mkinitfs -o /boot/$initfs $abi_release
+	ln -sf $initfs /boot/initramfs-$flavor
+	ln -sf vmlinuz-$abi_release /boot/vmlinuz-$flavor
+
+	# extlinux will use path relative partition, so if /boot is on a
+	# separate partition we want /boot/<kernel> resolve to /<kernel>
+	ln -sf / /boot/boot
+
+	#this is for compat. to be removed eventually...
+	ln -sf vmlinuz-$flavor /boot/$flavor
+	ln -sf initramfs-$flavor /boot/$flavor.gz
+	ln -sf /boot/vmlinuz-$flavor /$flavor
+	ln -sf /boot/initramfs-$flavor /$flavor.gz
+
+	# Update the /boot/extlinux.conf to point to correct kernel
+	f=/boot/extlinux.conf
+	if [ -f $f ] && grep -q -- "kernel /$flavor" $f; then
+		sed -i -e "s:kernel /$flavor:kernel /boot/vmlinuz-$flavor:" \
+		  -e "s:initrd=/$flavor.gz:initrd=/boot/initramfs-$flavor:" \
+		  -e "s:initrd /$flavor.gz:initrd /boot/initramfs-$flavor:" \
+		  $f
+	fi
 done